Hot-blast stove.



T. & T. I. COULTAS.

HOT BLAST STOVE.

APPLICATION HLED MAR. 9. 1914.

1,1 61 ,03 1 Patented Nov. 23, 1915.

3 SHEETS-SHEET I.

WITNESSES: INVENTOBS W 7%0/7741 $017M qpjzamm Z was BY I 7 W0 I ATTORNEYS COLUMBIA PLANOORAPH 60., WASHINGTON. D. c.

T. & T. 1. COULTAS.

ATTORNEY COLUMB A PLANDGRAPH C0 WASHKNGTON D C T. & T. I. COULTAS.

HOT BLAST STOVE.

APPLICATION FILED MAR. 9. m4.

1,161,031 Patented Nov. 23, 1915.

3 SHEETS-SHEET 3.

WITNESSES: /8 INVENTORS WW By r I ATTORNEYS acLumum PLANOORAPII (KI-.WASHINGTON, D. c.

nnrrnn srainsriarnrIr enrich.

THOMAS GOULTAS AND THOMAS I. COULTAS, O1 PITTSBURGH, PENNSYLVANIA.

HOT-BLAST srovn.

1,16Ltl3l.

1 0 all whom it may concern Be it known that we, THOMAS Commas and THOMAS I. Commas, citizens of the United States, residing at Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented new and useful Im- To enable others skilled in the art to which this invention appertains to construct and use the improved stove for blast fur naces, reference will be had to the accord panying drawings forming a part of this specification and wherein'like characters of reference are used to designate corresponding parts throughout the several views, in which Figure l is a vertical sectional. view; Fig. 2 is a cross sectional view therethrough on the line 22, 3-3; and Fig. 3 is an enlarged vertical sectional View of an upper fragment of the invention. i i

The invention comprises the central wellhole formed by the circular sub-well wall 1 and the well wall B, the latter beingv known as the B-wall and being concentric.

' with the subwell wall, and extended there above. U an outer circular wall A known asthe A- wall, and between the A-wau, and the well wall B, and concentric therewith is'a wall 0, known as the G-wall. The well walls and the A-walls are built uponthe stove foundation, and the C-wall rests upon'radial arch walls 2 and'arch blocks 3', the la-tter' bridging the spaces between the arch'walls 2 as in Patent No. 1,057,9i0. These'three principal walls provide the three passes for the blast and gas, the well-hole constituting" one pass, the space between the well'wall B and the (l-wall another, andjthe space be tween the C-wall and the l-lf-wall the third pass. Within the pass between the wellwall B, and the C-wall,and completely in dependent of bond therewith is provided the checker-work which" stands asa 'unitary structure capable of movement under ex Concentric with the "wellwalls, is'

Specification of Letters Patent. Patgntgd N 1g15 Application filed March 9, 1914. Serial No. 823,385.

pension and contraction due to the alternate heating and cooling effects, and such movement being entirely independent. of the un; related movements from the same causes,.of the well and Cwalls.

The. checker-work includes skin-walls. 5 and 6, respectively built againstand free of bond with, the B and C-walls. Atregularly spaced. intervals between theseskin walls, are provided withe-walls 7, 8 and 8; all of said walls 5 to 9 inclusive being circular and concentrically related. The spaces between the skin and withe-walls are divided by radial blocks and walls, as will be more specifically described, thereby dividing the second pass, or that pass between the B and C wallsintonumerous small flues.

The partitions to be later specifically'de scribed, which divide the outer pass into" numeroussmall-fines, is bonded with the A- wall and engage with, though entirely free of bond with the C-wall.

The entire stove is incased in a metallic shell comprising the cylindrical body section S and the dome section S, suitably connected together. To the upper end of the shell section S and interiorly thereof is riveted, or otherwise secured, a metallic ring 10 formed from an bangle iron co-incident with which is the upper termination of the A-wall. A skew-ring ll of refractory material rests upon the angle iron 10 within thechannel thereof, and upon the inner beveled edge'of the skew-ring is built the outer dome 14, supporting the stack wall 15. The upper face of the dome 14 alines' with the upper edge of the angle ring 11, and asthe shell section S extends slightly above the angle ring to support the dome with a skew-ring 16 which supports the re-' fractory inner dome 17. In its expansion,

this dome produces lateral pressure, upon the C and A-walls, which pressure is resisted bvthesteel shell S, and an insert of splits- 18 located between the shell S and portion of the shell S located within the hot zone of the furnace is increasedin thickness as indicated by numeral 19 in Fig. 1. Below the hot zone the space between the shell S and A-wall is packed with loam or cinders 20 to permit lateral expansion of the A-wall. The cinder packing 2O terminates at a point substantially adjacent the lower endofthe C-wall where a few courses of splits 21 fill the bottom of the space hetween the shell S and A wall.

In Fig. 2 is illustrated the construction of the various courses 2 and 3, one course alternating with the other throughout the structure. In course 2, the well wall A 1s composed of two superposed layers of bricks 22 and 23; the skin walls 5 and 6 of bricks 24, 25 respectively; the circularwithe walls of brick 2 6, 27 and 28; the A-wall of two horizontally parallel layers of bricks 29, 30; and

the C-walllof bricks 31. In course 3, the well wall A is composedof two superposed layers of bricks 32, 33; the skin walls 5 and .6 of bricks 34, 35 respectively; the circular,

withe walls of bricks 36, 37 and 38; the A- wall of two superposed layers of bricks 39, and the C-wall of bricks 41. Inboth courses, radial withe walls divide the passages between the skin walls 5 and 6 and the circular withe walls into numerous small flues. In course 2, the radial withe walls 42 and 43 of bricks set end toend are provided and in course 3 the radial withes 44 and 45 are provided for the same purpose. The radial withe walls 42 and 43 abut theC- walls and pass through the skin wall 6 and the circular withe walls 7 and8. The radial withe wall 42 abuts the circular withe wall 9 and the radial withe walls 43 pass through the circular withe wall 9 and skin wall 5 and abut the wellwall B. Neither of the radial withe walls 42 nor43 bonds with the C orwell walls. To prevent the bricks of a the skin wall from becoming dislodged, due

to expansion, contraction or warping, they are, in course 2, beveled at their ends 46.to receive the tapered ends 47 of the radial withe walls 43.

In course 3, neither of the radial withe tively in radial series, butmerely placed be tween the several walls, and withes 45 being absent between the skin wall .5 and circular withe wall 9.

The passage between the A and c-wnn is likewise divided into small flues bywithes 50 and 51 respectively in the two courses.

I The withes 50 of course 2 merely abut without bond with the 0 wall and layer 29 of the A-wall, but pass through the layer 30 of the A-wall and hence have bond with the A-wall alone. The withes 51' of course 3 have bond with neither of the walls A and C, being merelyinserted betweenthe two. The radial bricks 50 aline with the radial withe walls 42 and 43 and those 51 with the withes 44 and 45, and all bricks of one course aline vertically with the corresponding bricks of the next course, hence each course corresponds with and is supported by or supports the next adjacent course throughout the structures. 4

In practice, the efiect of the alternate heating by the gas and cooling by the blast with the incident severe vibration, results in warping, chipping, settling and other injuri- 'ous effects upon the bricks and walls individually and collectively, and it is to prevent this as much as possible and when not so to make the repair as easy and inexpensive as possible, without necessitating razing of the major portion of the structure. It has been found with the usual stoves of this type that the Awall, which is intended to be and should be the most permanent vertical wall of the entire structure and should'last the lifetime of the structure, in due course of time materially settles, thereby letting down bodily the upper or outer dome 14 and in some 1n. Toobviate this, the dome supporting instances permitting said dome to cave ring 10 of this invention is provided whereby the dome is supported independently of the A-wall and at the same time the A-wall is permitted its independent movement in expanding and contracting or settling,and

further is permitted to be repaired without necessitating razing of the dome 14.

In the event of the well-wall B becoming deranged from any cause, it may be readily repaired without disturbing the checkerwork or any other wall of-the structure, as it stands aloneas a unitary structure capable of its own'peculiar movements in ex panding andlcontracting or otherwise.

The checker-work, which likewise stands as a unitary mass free from bond with the well wall B or the C-wall, may expand or contact freely and unrelatedly to the movements of said walls B and C. When the checker-work is to be repaired it may be torn out without derangement of the B or C-Walls, and may be rebuilt as in the initial construction.

work being removed to permit access to said C-wall. a 7

It will be noted that the severe actions of the several agencies upon the vertical walls of t ese sto e i S 1 s to f equ ly c sion what is known as short circuiting of the passes. If a brick in any of, the vertical walls becomes disintegrated or dislodged, the gas or blast currents instead of taking the prescribed coursethrough the several passes and lines, cuts through the aperture formerly occupied by the dislodged brick, thereby destroying the effectiveness and in all cases necessitating immediate repair. .Thus the item of repair with its incident expense and consummation of time, becomes as important a factor as the item of initial construction and effectiveness in operation.

What is claimed is:

1. In a hot blast stove, a well-wall, a second wall spaced therefrom and forming a pass therebetween, and a third wall spaced from the second and forming a pass there- 'between, checker-work dividing the pass bethe second wall, a dome forming a continuation of the third wall, said well wall, checker work, second wall, and third Wall being free from bond with each other and movable under expansion and contraction independently of each other, and the dome being supported independently of all of the said walls.

3. In a hot blast stove, a shell, an outer wall inclosed thereby, an inner wall inclosed by the outer Wall, said outer wall being spaced from the shell and inner wall and movable under expansion and contraction independently thereof, said space being partially filled with a yielding material, checker-Work bonded with the outer wall and free from bond with the inner Wall, a dome on the inner wall causing, outward pressure to be exerted on the outer wall, and a relatively non-yielding material filling the remainder of said space and being located 7 to resist said outward pressure, and an outer dome supported independently of said outer wall.

In testimony whereof we have hereunto set out hands in presence of two subscribing witnesses.

THOMAS COULTAS. THOMAS I. COULTAS.

Witnesses: I

WM. J. COULTAS, CHAS. A. MARTIN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents.

7 Washington, D. C. 

